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STMicroelectronics LM2901DT
- Part No.:
- LM2901DT
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2901DT.pdf
- Description:
- IC COMPARATOR 4 GEN PUR 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:13,014
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Product details
Overview
LM2901DT from STMicroelectronics is a low-power quad voltage comparator in SO-14 package, designed for single-supply operation from +2 V to +36 V (or ±1 V to ±18 V), with 1.1 mA total supply current, 25 nA typical input bias current, and rail-to-rail input common-mode range including the negative rail. It drives TTL, CMOS, and ECL loads in level detection, window comparators, and zero-crossing circuits.
For engineers reviewing the LM2901DT datasheet, LM2901DT pinout, LM2901DT application, or LM2901DT equivalent, this page delivers verified electrical parameters, SO-14 terminal mapping, real-world use cases in industrial sensing and power monitoring, and validated drop-in alternatives with documented functional trade-offs.
Technical Context
The LM2901DT integrates four independent open-collector comparators with PNP input stages enabling input voltages down to the negative rail (GND in single-supply mode) and differential input range equal to full supply voltage (±36 V). Its output stage sinks up to 16 mA while maintaining 250 mV typical saturation voltage at 4 mA load.
It operates across -40 °C to +125 °C with 1.3 µs small-signal response time (100 mV step, 5 mV overdrive) and supports mixed-logic interfacing via TTL/CMOS-compatible outputs without external pull-ups in many configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2 V to +36 V (single) or ±1 V to ±18 V (dual) - enables direct interface with 3.3 V, 5 V, 12 V, and 24 V industrial rails |
| Supply Current (all 4) | 1.1 mA typ. at +5 V - reduces system power budget by >50% vs. legacy quad comparators |
| Input Bias Current | 25 nA typ. - minimizes loading on high-impedance sensor references (e.g., thermistors, RTDs) |
| Input Offset Voltage | 1 mV min., 7 mV typ. - supports accurate threshold detection within ±10 mV windows |
| Output Saturation Voltage | 250 mV typ. at 4 mA sink - ensures reliable logic-low recognition with 3.3 V or 5 V microcontrollers |
| Response Time | 1.3 µs (small-signal) - sufficient for line-frequency monitoring (50/60 Hz) and motor phase detection |
| Common-Mode Input Range | Includes negative rail (0 V in single-supply) - eliminates need for level-shifting in ground-referenced sensing |
Pinout & Package
LM2901DT uses the standard SO-14 (Small Outline) plastic package, 8.75 mm × 4.0 mm body, 1.27 mm lead pitch, surface-mount compatible with IPC-7351B footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting input of comparator 1 | Accepts reference or signal to be compared against non-inverting input (pin 2); supports rail-to-rail common-mode |
| 2 | Non-inverting input of comparator 1 | Typically connected to sensor output or adjustable threshold; high-impedance (25 nA bias) minimizes source loading |
| 3 | Output of comparator 1 | Open-collector NPN - requires external pull-up to VCC or logic rail; sinks up to 16 mA |
| 4 | GND / VCC− | Negative supply or ground reference; serves as return path for all four comparators and input common-mode baseline |
| 5 | Non-inverting input of comparator 2 | Independent input node; electrically isolated from other channels - enables multi-threshold monitoring |
| 6 | Inverting input of comparator 2 | Paired with pin 5 for second comparator; identical electrical specs to pin 1 |
| 7 | Output of comparator 2 | Open-collector output; shares no internal connection with pin 3 - allows independent load interfacing |
| 8 | VCC / VCC+ | Positive supply for all comparators; accepts 2–36 V DC - eliminates need for LDO pre-regulation in wide-input systems |
| 9 | Inverting input of comparator 3 | Third independent input pair; matches pins 1/6 in performance and layout sensitivity |
| 10 | Non-inverting input of comparator 3 | Used for third threshold comparison; supports same input voltage range as pins 1–2 and 5–6 |
| 11 | Output of comparator 3 | Third open-collector output; fully decoupled - enables parallel or cascaded logic functions |
| 12 | Non-inverting input of comparator 4 | Fourth comparator input; completes quad set - suitable for redundant sensing or hysteresis feedback |
| 13 | Inverting input of comparator 4 | Paired with pin 12; identical bias and offset characteristics - ensures channel-to-channel matching ≤15 mV |
| 14 | Output of comparator 4 | Final open-collector output; rated for same sink current and saturation voltage as pins 3/7/11 |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range including GND | Enables direct interface with ground-referenced sensors (e.g., current shunts, thermocouples) without level-shifting circuitry |
| Low 1.1 mA total supply current | Supports always-on battery-powered applications (e.g., smoke detectors, remote monitors) with >1-year runtime on CR2032 |
| 25 nA typical input bias current | Preserves accuracy in high-Z voltage divider networks (e.g., 1 MΩ+ resistive sensors) without significant offset drift |
| Open-collector outputs with 16 mA sink capability | Drives LEDs directly, interfaces with 3.3 V/5 V/12 V logic families, and supports wired-OR bus configurations |
| Wide operating temperature: −40 °C to +125 °C | Validated for under-hood automotive, industrial PLC I/O modules, and outdoor power electronics enclosures |
Applications
| Overvoltage Protection Circuit | Temperature Threshold Monitor |
|---|---|
|
Use Scenario: Detecting when a 24 V DC bus exceeds 27 V to trigger shutdown via MOSFET gate control. IC Role / Device Role / Timing Role: Comparator 1 compares bus voltage (divided 1:10) against 2.7 V reference; output pulls gate low via open-collector sink. Use Value: Eliminates need for dedicated supervisor IC; leverages rail-to-rail input to sense down to 0 V during fault recovery. |
Use Scenario: Monitoring NTC thermistor voltage in HVAC blower motor to disable drive above 85 °C. IC Role / Device Role / Timing Role: Comparator 2 compares thermistor divider output against fixed 1.8 V reference; hysteresis added via feedback resistor. Use Value: 25 nA input bias avoids self-heating error in 100 kΩ thermistor network; 1.3 µs response prevents thermal runaway. |
| Zero-Crossing Detector (Single Supply) | Window Comparator for Battery SOC |
|
Use Scenario: Generating clean 50/60 Hz timing edges from AC mains for TRIAC dimmer synchronization. IC Role / Device Role / Timing Role: Comparator 3 biased at VCC/2 via resistor divider; AC input coupled through series capacitor; output triggers MCU interrupt. Use Value: Input common-mode includes GND, allowing direct coupling without negative supply - reduces BOM count by one regulator. |
Use Scenario: Indicating lithium-ion battery state-of-charge between 3.0 V (low) and 4.2 V (full) using two thresholds. IC Role / Device Role / Timing Role: Comparators 1 and 2 form upper/lower bounds; outputs feed AND gate to assert "OK" only within window. Use Value: Quad integration enables full window function in one SO-14 package; 7 mV typical offset ensures <±10 mV threshold tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad voltage comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM339DT | Higher supply current (2.0 mA), wider offset voltage (2–30 mV), same SO-14 pinout | Less suitable for battery-critical designs; acceptable where 5 V logic compatibility and cost dominate | Select when legacy design reuse or lower unit cost outweighs power savings |
| TLV3704IDR | Rail-to-rail output, 85 µA supply current, but max VCC = 16 V and −40 °C to +125 °C rating | Not viable for 24 V industrial bus monitoring; preferred in ultra-low-power portable instrumentation | Choose only if system VCC ≤16 V and sub-100 µA quiescent current is mandatory |
Compared with LM2901DT, LM339DT trades 82% higher supply current for broader voltage tolerance and lower cost, while TLV3704IDR achieves 92% lower current but sacrifices 20 V headroom - making LM2901DT optimal for 12–36 V industrial sensing with balanced power/performance.
Availability
LM2901DT is available at Aetrix Electronics and suitable for overvoltage protection, temperature threshold monitoring, zero-crossing detection, and battery window comparison requiring stable component supply across automotive, industrial control, and power management systems.
Supply support for LM2901DT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The LM2901 product line delivers precision, low-power quad comparators optimized for robust operation in harsh environments - targeting industrial automation, motor control feedback, and automotive body electronics where reliability and wide supply range are critical.
FAQ
Can LM2901DT operate from a single 3.3 V supply?
Yes. The LM2901DT supports single-supply operation from +2 V to +36 V. At 3.3 V, it maintains full functionality: input common-mode range includes 0 V, output saturates to ≤400 mV at 4 mA sink, and supply current remains ~1.1 mA. This enables direct interface with 3.3 V microcontrollers without level shifters.
Does LM2901DT require external pull-up resistors on its outputs?
Yes. All four outputs are open-collector NPN transistors and must be pulled up to a valid logic rail (e.g., VCC, 3.3 V, or 5 V) via external resistors. Typical values range from 4.7 kΩ (for 1 mA sink) to 10 kΩ (for low-power wake-up signals); values below 2.2 kΩ may exceed 16 mA absolute maximum sink rating.
How does LM2901DT handle input voltages exceeding the positive supply rail?
The LM2901DT permits differential input voltage up to ±36 V and allows either input to swing up to +36 V regardless of VCC, provided the other input stays within the common-mode range (0 V to VCC −1.5 V). This enables overvoltage-tolerant sensing but requires current limiting (e.g., 100 kΩ series resistor) to prevent damage from sustained overvoltage.
Is LM2901DT pin-compatible with LM339?
Yes. LM2901DT and LM339 share identical SO-14 pinout, terminal functions, and open-collector output architecture. However, LM2901DT offers lower supply current (1.1 mA vs. 2.0 mA), tighter input offset (7 mV vs. 2 mV min.), and guaranteed operation down to +2 V supply - making it a functional upgrade with no PCB change required.
LM2901DT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 4
- Output Type:
- CMOS, DTL, ECL, MOS, Open-Collector, TTL
- Voltage - Supply, Single/Dual (±):
- 2V ~ 32V, ±1V ~ 16V
- :
- 7mV @ 5V
- Voltage - Input Offset (Max):
- 0.25µA @ 5V
- Current - Input Bias (Max):
- 16mA @ 5V
- Current - Output (Typ):
- 2.5mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 14-SO
LM2901DT FAQ
1.How can I place an order for LM2901DT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2901DT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM2901DT reliable?
The price and inventory of LM2901DT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2901DT is usually 5 days.
3.What payment methods are accepted for LM2901DT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2901DT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2901DT?
LM2901DT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2901DT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM2901DT?
For technical support, including LM2901DT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2901DT requirements.
6.How does Aetrix verify that LM2901DT is sourced from the original manufacturer or authorized distributors?
All LM2901DT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2901DT meets industry standards.
7.What is the process for return or replacement of LM2901DT?
All LM2901DT units undergo pre-shipment inspection (PSI). If there is an issue with LM2901DT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM2901DT part is unused and in its original packaging.
Return procedure for LM2901DT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2901DT Tags
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